Drain adaptor



FIG. 1 is a perspective view of our design;

FIG. 2 is a left side view thereof, it being understood that the opposite side is a substantial mirror image;

FIG. 3 is a rear view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

It being understood that the broken lines shown throughout the drawings are for illustrative purposes only and form no part of the present design. 

The ornamental design for a drain adaptor, as shown and described. 